Power-shovel



H. H. HARRIS.

POWER SHOVEL.

APPLICATION FILED MAR. 15, 1919.

3 SHEETS-SHEET I.

H. H. HARRIS.

POWER SHOVEL. APPLICATIQN FILED MAR.15, I919- Lfiwmw Patented m. n, 1921., I 3SHEETS-SHEET s.

f 9/ as a W i f4 90 {ya E 76 W 2 g k, ff/mwrfor WWW a boom carrying the same .HOLIILIS H. HARRIS,

O15 LORAJEN, OHIO, ASSIO-NOR TO THE 'JDHJEW SHOVEL COMPANY, OIIE LORAIN, OHIO, A CORPORATION OF omo; v

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To all whom ,it may concern:

Be it known that I, HoLLIs H. Hams, a citizen of the United States, residin at Lorain, in the county of Lorain and tate of Ohio, have invented a certain new and useful Improvement in Power-Shovels, of

which the following is a full, clear,fand exact description, reference being had to the accompanying-drawings.-

This invention relates tosteam shovels and the like wherein a dipper and dipper stick .are caused to travel with relation to and one of the essential objectsof the invention is to provide a light, strong and elastic boom construction. Another object of the invention is to provide a novel guiding means for the dipper stick in connection with the boom and mechanism for operating the dipper. The invention is more fully described in connection with the accompanying drawings, illustrating a preferred embodiment thereof, the essential characteristics being summarized in the claims.

In the drawings, Figure lis a side elevation of the steam shovel embodying the present invention; Fig} 2 is an enlarged side elevation of the boom; Fig. 3 is a plan of the I same; Fig. 4 is a longitudinal section taken on the phlane indicated by the line 4-4: of ig. 5 is a similar section taken on a plane parallel with the plane' of Fig. 4

, indicated. by the line 5-'5 of Fig. 3; Fig. 6

is an enlarged transverse section through.

the boom, dipper stick and operating mechanism therefor;- Fig. 7 is a transverse section through the boom onthe same scale as Fig. 6; taken on a plane indicated by the i line 77 of Fig. 4; F ig.8 is a similar secplates 9at the free end tion indicated by the line 8 -8 of Fig. .9 is a sectional view showing a swivel guidthe boom and dipconnection between the boom and the rack on the dipper stick.

In Fig. 1, 'issho wn a suitable truck 1 on which is swivelly mounted a platform 3, carrying a housing 5 for mechanism for raising and lowering the boom 6 and for Gabi-ace rod "anchored at one end within the rotating the frame 3 on the truck. 7 is a housing and attached to a cross beam 8 on of the boom. The usual dip-per, 10 is shown as suitably carried .on a dipper stick 12, guided through amsm (not shown) 4 .Fig.

the boom. A cable 13' extends over a pulley 14 on. a shaft 15,, at the outer end of the boom, then through a pulley'block 16 and over a second I pulley on the shaft 15, (arran ed beside the pulley 14c) and attached at 1 on the pulley block. .The pulley block is attached to a bail l8 pivoted at. 19 to opposite sides of the dipper. Suitable-moon for drawing upwardly on the dipper by winding. the cable 13 is providedinside the housing 5. i

. In the construction of steam shovels for certain kinds of work, it is desirable to have the boom as light, strong and, particularly, as elastic as possible. I have accordingly devised a novel boom construction, embodying'a peculiar arrangement of bracing wood strips and a minimum amount of structural iron or steel. The construction of the boom, as illustrated particularly in Figs. 2 to 8, will now be described. 1

v Patented Oct. 111, 1921i.

A Application filed March 15, 1919. Serial No; 282,929. l l

At 20, 20 are indicated side plates of .iron l or steel, extending throughout the length of the boom and braced at their upper'edges by angle members 21 extending substantially the full length of the plates. At the lower edges are similar angle irons or beams 22 extending from the outer end of the boom to the widest portions thereof adjacent the rear or lower end of the boom. Transverse angle members 23, 24: and 25 are shown as extending between the flanges of 21 and 22 at separated points, thus forming a rigid beam construction. Between the plates 20, 20 at provide a peculiar arrangement of wood preferably in the form of short narrow strips pf heavy plankin shown as, arranged substantially as fo lows:

Extending parallel with the upper edges of the plates 20 from the rear ends of the plates forwardly/for afew feet is a series of such wood members placed side by side, as indicated at 28, through which bolts 29 extend, securing the plates 20 thereto. This series, of strips forms adistance member between the plates at the rear of the boom. The rear lower edges of" the strips 28 are chamfered and similar stripsi30extend from the rear portion of the strips 28 and plates 20 forwardly along the sloping edge of these plates. prefer to arrange strips 30 in such-fashion as to alternately engage and dove-tail into strips 34 sloping from a point somewhat ahead of the ends of-the strips the angles lot 28 downwardly to the widest portion of the plates as shown in Figs. 4 and 5. Between the overlapping strips are shorter strips each cut to abut the upper side of the opposite strip in the same plane. Bolts 33 and 35 extend through the members and 34 respectively. At 36 is shown a single bolt extending through the overlapping portions of these wood members.

The boom may be pivotally attached to the frame or platform 3 by suitable brackets 40 preferably comprising offset plate-like members 41 having suitable openings for receiving a transverse shaft or pivot p1n on which the boom is supported, and extending along'the plates 20 and secured thereto by a bolt 43 assing through both these plates and the Forward ends of the brackets. Bracing ribs 44 are shown as leading from a point adjacent the bolt 43 to the rearward portions of the members 41 and suitable webs 45" add to the strength of the bracket by closing the space between the ribs 44 and members 41. Bolts 46 at either side of.

the ribs 44 pass entirely through both plates 20 and the intermediate Wood members 28 and 30.

Near the free outward end of the boom, the plates 20 are spaced apart and braced by an arrangement of wood members somewhat similar to the members 30 and- 34 as follows: Members 50 and 52 extend diagonally from the upper edge of the plates substantially to the lower edge. The alternate members overlap with intermediate members, being cut shorter to fit against the upper edges of the longitudinally alined corresponding members, as described in connection with .the strips 30 and 34. Thus a member 50 extends from the upper edge of the plate 20 to the upper edge of a member 52 which in turn extends from the upper edge of the plate 20 rearwardly and point. S1milar washers are provided for the bolts 29 and 35, for the same purpose.

The arrangement of lates 9 at the outer end of the boom is il ustrated clearly in Figs. 2 to 5. The openings indicated at 15 through [the plates 9 and .20 receive the shaft 15.

To additionally strengthen the boom and provide an economical and very satisfactory member.

guide for the dipper stick I arrange parallel with the lower edges of the plates 20 sections of railroad rails indicated at 60, having their flanges abutting these plates and suitably riveted thereto.

These rails preferably extend from )OllltS adjacent plates 9 rearwardly througi the overlapping portions of the wood strips 30 and 34, 50 and 52, these strips being cut away (as indicated particularly in Figs. 7 and 8) to accommodate these rails. Thus it. will be seen that the boom has an intermediate rectangular opening allowing wide angular movement of the dipper stick. The heads of the rails 60 engage and guide the stick and effectively prevent side play.

Along intermediate portions of the boom, I provide additional strips of metal at 62 on the upper faces of the'flanges of the angles. 21. These strips aresuitably riveted to these flanges and at the rear of the strips, preferably above the wood bracing members 34, is a transverse plate 64 riveted to the flanges of the angles 21. This plate provides a suitable base for a small steam engine indlcated at 65, which may actuate the dipper stick through suitable gearing.

The driving mechanism. for the dipper stick is shown particularly in Figs; 1, 6 and 9. It may conveniently comprise a crank shaft 66, driven by the connecting rod of the engine, and having a pinion 67 meshing with a gear 68 on the shaft 69, extending transversely of the boom and provided at each end with pinions 70, meshing with gears 72 on a shaft 73. The shafts, 69 and 73 are provided 'with bearings in suitable brackets 74 secured along the strips 62 on the upper side of each structural side frame On the intermediate ortion of the shaft 72 is a heavy toothe gear 75, meshing with a rack 76,,secured to the lower side of the dipper stick, whereby power may be transmitted from the engine to the gearing described to move the dipper stick longitudinally. Between the gear 75 and the bearing brackets 74, the shaft 73 is embraced by bearing members of bracket arms 82, which are connected at their outer I ends by transverse cap 84. The inner sides of the bracket arms 82 and cap 84 embrace three sides of the dipper stick while the lower side is supported on the gear 7 5, thus forming a pivoted swinging guide for the stick, allowing the free swinging movement thereof while providing simple and very positive driving mechanism.

The cable 13, for raising the dipper stick, tends to interfere with the free movement of the dipper stick or associated mechanism. To prevent this, I mount, on one of the bearings 74, a bracket 86 carrying a sheave 88 mounted at an an le to the shaft and boom, as illustrated in d ig. 6. The cable 13 is passed under the lower side of this sheave as shown-in Fig. 1, providing a positive guide therefor and deflecting the cable from the path of the stick. Thisguide is preferably at a point near the pivot of the dipper stick,

.5 whereby it need deflect the cable but slightly to'clear the stick. The angle of the sheave is such thatthe deflection of the cable is through the same plane as the sheave itselfl' The construction of the dipper-stick may it be accomplished in a very simple and economical manner by the use of two inwardly facing channel members 90 and a plate 91 secured across the upper flanges of these channels and the rack 76, secured along the lower flanges. This forms a rectangular boxlike structure, rigid in character and readily adaptable to being guided by the guides 82 and rails 60. j

It will beseen from the foregoing descrip-' tion, that I have provided a simpleand economical boom and dipper constructions.

' Practice has demonstrated that it is very durable, and the elasticity of the wood pre vents the usual wear on the bolts, which ma be tightened readily.

aving thusdescribed my invention what I claim is p 1. In a boom construction, the combina tion of a pair of structural side frame members, aplurality of wood blocks secured side by side ,between the side frame members adjacent each end thereof leaving an intermediateopening, guides adapted to embrace a dipper stick, and mounted on the structural side members.

'2. lin' a boom construction, the combination of structural side .frame members, a-

plurality of s acing strips of wood arranged side byside .etween the. side frame memeu bers adjacent each end thereof, an inwardly projecting rail on each frame member extending between the strips at the ends and forming a guide adapted to engage a dipper stick. f

' t5 3. A boom construction, comprisingstructural side frame members, means for spacin the side frame members apart and suit-i ab y bracing them to form a rigid structure and a T-head rail section secured to the inner side of a structural frame member and extending longitudinally thereof.

4E. The combination in a boom, of structural side frame members, intervening strips of Wood mounted side by sidebetweensa'ld members adjacent each end thereof, connecting members extending through the ,sld'e members and through said strips, T-head rail sections mounted on the inner side of the frame members and extending longitucc dinally thereof between said blocks. T X

5. A boom for a ower shovel, comprising structural side frame members, a plurality ofwood members. arranged contiguq ously, and extending diagonally along the side frame members for a considerable dis+ luff tance near each end of the structural side.

frame members, and securing means extending through the side frame members and through said wood members. A. 6. j, boom for. a power shovel, comprising structural side ,frame -members, interv mediate bracing and spacing members comstructural side frame members, intermediate.

bracing members ,comprising sets of .wood strips arranged side by side and extendin diagonally of the side frame members an between them, said strips being arranged so that the ends of alternate strips dove-tail together and form an open V, and intermediate strips between the dove-tailed strips each abutting the. upper edge of the corresponding strip in the same plane.

8.. A boom for a power shovelfcomprising structural side frame members spaced apart by a plurality of wood strips," said strips being arranged diagonally of theside frame members and in sets, one set of such strips forming an angle with the other set,

strips ofthe, one set overlapping the ends of strips of the other set, intermediate strips between the overlapping strips e'ach extend ing to and abutting the near side of the corresponding overlapping'strip in the same plane. I

9. A boom for a power shovel comprising structural side framemembers spaced apart by a plurality of Wood strips, said strips being arranged diagonally of the side frame members and insets, strips of the one set overlapping the ends of, strips of the other set, and a bolt through the overlapping. portion thereof and through the side members.

10. A boom fora power shovel, compris- ,ing a pair of structural side frame members, and a plurality of strips of wood between the side frame members adjacent the rear end of the boom, said strips being contigu ously arran ed in sets, one. set extending longitudinally of the boom and another set extending from the longitudinal set diagonally of the side frame members, a third set of strips extending between and some of the strips of which overlapthe stripsof the second named set and form an angle therewith. 11. A boom for a power shovel, having structural side frame members and intermediate spacing members, the side frame members .comprisin plates bra'ced by angle members along its edges, wood spacing members between the plates, -bolts through the plates and spacing members and washers for the bolts extending over and engagin one flange. 0f the angle member on eac plate. i

not

12. In a boon construction, the combination of a pair of structural side frame members, spacin means between said members,

T-head 'gui e rails extending along the inner sides of said structural members and adapted to embrace a dipper stick, transverse members connecting the boom and forming an engine platform, a dipper, a

dipper stick engaging the heads of said rails, and means for actuating the dipper stick driven by said engine.

13. In-a boom constructiomthe combination of a pair of structural side frame memfor actuating the dipper. stick driven by sa d engine. 14. The combination with a boom, a dip per stick extending therethrough a dipper carried thereby, pulleys carried by the boom,

a flexible member for operating the dipper, guide pulleys on the boom and attached to the dipper over which said flexible member may run, means for drawing on said cable at the rear of'the boom, and means for deflect-- ing the cable to avoid the dipper stick comprising a bracket and sheave mounted on the boom adjacent the dipper stick.

.15. In a power shovel, the combination of a boom, a cable extendin to the upper end thereof, and normally a ove the boom, a dipper stick extending through the boom, means for operating the dipper stick carried by the boom, including a swivel guide for the dipper stick, and earing connected with the dipper stick ad acent the guide, and means for deflecting the cable from the pathiof thedipper stick comprising a pulley mounted adjacent to said guide and sloped upwardly and inwardly and adapted to be en aged at the under side by the cable.

11 testimony whereof I hereunto aflix my signature.

HOLLIS H. HARRIS. 

